alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Outbound .png HTTP GET flowbit set"; flow:established,to_server; flowbits:set,ET.httpget.png; flowbits:noalert; http.method; content:"GET"; http.uri; content:".png"; endswith; classtype:misc-activity; sid:2034212; rev:2; metadata:created_at 2021_10_18, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_14;)